component/pillow: explicitly use our own libraries.

component/pillow/buildout.cfg

 [buildout]
 extends =
   ../freetype/buildout.cfg
+  ../jbigkit/buildout.cfg
+  ../lcms/buildout.cfg
   ../libjpeg/buildout.cfg
+  ../libtiff/buildout.cfg
+  ../webp/buildout.cfg
   ../zlib/buildout.cfg
 
 parts =
@@ -12,13 +16,25 @@ recipe = zc.recipe.egg:custom
 egg = Pillow
 include-dirs =
   ${freetype:location}/include
+  ${jbigkit:location}/include
+  ${lcms2:location}/include
   ${libjpeg:location}/include
+  ${libtiff:location}/include
+  ${webp:location}/include
   ${zlib:location}/include
 library-dirs =
   ${freetype:location}/lib
+  ${jbigkit:location}/lib
+  ${lcms2:location}/lib
   ${libjpeg:location}/lib
+  ${libtiff:location}/lib
+  ${webp:location}/lib
   ${zlib:location}/lib
 rpath =
   ${freetype:location}/lib
+  ${jbigkit:location}/lib
+  ${lcms2:location}/lib
   ${libjpeg:location}/lib
+  ${libtiff:location}/lib
+  ${webp:location}/lib
   ${zlib:location}/lib